Deciding Thresholds for Feature Detectors

[dnstanciu]

We need to find adequate threshold values for our feature detectors (i.e. good quality, not too many, not too few keypoints).

We are currently focusing on no of keypoints. Need to plot a histogram for the no of detected keypoints for each detector, for all images to get a rough idea of what the default detector thresholds produce.

[dnstanciu]

WIP in Keypoint Detection notebook in work repo.